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GRATE.

Patented Mar. 3, 1885..

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GRATE.

Patented Mar. 3, 1885.

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UNHED STATES BATENT @rrrcie.

SPECIFICATION forming part of Letters Patent No. 313,282, dated IMarch 3, 1885.

Application filed June 10, 1894 To all whom it may concern.-

Be it known that I, PETER E. BLow, of Joplin, in the county of Jasper and State of Missouri, have invented certain new and use ful Impr ovements in Grates, of which the following is a specification.

The invention is intended more especially for use in connection with gas and boiler furnaces.

The objects of my improvements are to provide a dumping tubular grate having a water circulation therethrough, to improve the operation of the grate and insure a perfect combustion of the fuel by permitting the water,together with the steam generated in the circulation of the water through the grate, to escape beneath the grate, and to provide a practical connection between the hollow gratebars and the hollow end sections of the grate, which will permit the expansion and contraction of the parts. 7

The invention also contemplates certain other and further improvements in structure and organization more or less dependent upon the primary features above mentioned.

In the accompanying drawings, Figure 1 is a plan view; Fig. 2, a front view of a portion of the structure, and Fig. 3 a vertical section.

A represents the furnace-wall, and A the bearing-blocks on which the grate rocks. The grate is composed of hollow tubular bars 6, which are secured in hollow end or side sections,B B. The trunnions on which the grate rocks are formed. or secured on the end section B. A dump rope or chain, 0, is con nected with the opposite end section B,passes over a pulley, and is provided with a counterbalancing-weight, G. The grate is maintained in its normal elevated position,by a hook on the counterbalancing-weight which engages in a suitable eye. Of course, however, any other convenient devices may be employed. \Vhen this hook is disengaged,the grate will fall by gravity and dump the contents into the ash-pit below. The return of the grate to its elevated position is facilitated by the counterbalancing-weight.

A constant water circulation through the grate is maintained by means of a flexible hose or supply pipe, D,which connects with a pipe, (I, projecting from the hollow end-piece B of the grate. The hose is preferably sustained (No model.)

by a fixed support, over which it is drawn as the grate is raised and lowered. This supthrough a pipe, E, connected with the end section B at a point above the level of the connection of the grate-bars. This pipe is extended down below the grate-bars,and is preferably bent at right angles, so as to extend across the under side .of the grate at right angles wit-h the grate-bars. The horizontal portion of the pipe below the grate is perforated, so as to permit the escape of steam and water. Themoisture thus deposited below the grate maintains the parts at a lower temperature than would otherwise be the case, while the steam being carried upward by the draft will insure a more perfect combustion of the fuel.

The connection between the discharge-pipe E and the end section B is located above the level of the grate-bars, as before stated, so as always to keep the grate-bars filled with water.

Of course the, advantages of water circulation in grates of this class is well understood. The deposit of clinker on the bars is prevent- 'ed,and the bars are lessliable to be burned out.

The grate bars I) are preferably screwthreaded, and are screwed into the hollow end section B. Their opposite ends, howevenare secured in the end section B in the following manner: This section of the grate is provided with a series of sockets for the reception of metallic packing-boxes F, through which the grate-bars pass. These packing-boxes are secured in place by glands G, which are screwed down upon the boxes by screw-bolts 9. By this construction the endwise expansion of the grate-bars is taken up, and in case the bars become brokenor it is desired to remove them for any purpose, they can be backed or pushed into the end piece B until they are free of the end section B, when they may be withdrawn from the end piece B. New bars may be ingrates of this class, it is desirable to provide some means for sustaining the fire when the grate is dumped to discharge the collection of ashes and clinker next to the grate-bars. For this purpose I use a stationary frame, I, supported upon the walls of the furnace just above the rising and falling end of the grate. This frame is provided with a series of shelves, i, for the support of bars, which may be thrust through the fire until they rest upon the side piece B of the grate. WVhen the grate is dumped, therefore, the fire will be sustained.

Of course the details of construction may be varied in many particulars without departing from the spirit of my invention. For instance, the water circulation maybe taken in through the trunnions or journals of the grate and discharged from the opposite end piece B in the same manner as already described. Other changes will readily suggest themselves to those skilled in the art.

I am aware that dumping-grates are old, and I am also aware that grates having a water circulation are old,and that in such grates the bars have been connected with the end piece by couplings to compensate for the expansion and contraction of the bars.

I claim as my invention 1. The combination, substantially as set forth, of a dumping hollow grate, a flexing tube or water-supply pipe connected with the grate so as to accommodate itself to the rising and falling of the grate, and a discharge-pipe.

2. The combination, substantially as set forth, of a hollow grate, water-supply connections, and a discharge-pipe for the exit of the steam and water arranged below the grate.

3. The combination, substantially as set forth, of the hollow grate, the Water-supply connections which permit the dumping of the grate and maintain a constant circulation of water therein, and the discharge-pipe arranged below the grate, as set forth.

4. The combination, substantially as set forth, of the hollow grate-bars, the hollow end sections, the water-supply connections, and the water-discharge pipe connected with the end section of the grate above the level of the grate-bars and carried down so as to discharge the steam and water beneath the grate, as set forth.

5. The combination, substantially as set forth. of the hollow grate-bars, the end sec tion B, the packing-boxes, and the securingglands.

6. The combination, substantially as set forth, of the dumping-grate.and the frame or shelved support arranged above the rising and falling end of the grate, substantially as, and for the purpose set forth.

In testimony whereof I have hereunto subscribed my name.

PETER E. BLOW.

WVitnesses:

F. M. REDBURN, GALEN SPENCER.

I r i J 

